Which sentence best illustrates the exposition in "​ R.M.S. Titanic"? A. "Out of the dark she came, a vast, dim, white, monstrous shape, directly in the Titanic’s path." B. "The dense throngs stood quiet as the first survivor stepped down the gangway." C. "Her bulk dwarfed the ships near her as longshoremen singled up her mooring lines and cast off the turns of heavy rope from the dock bollards." D. "It explodes, and a parachute of white stars lights up the icy sea."